1969 Volume 42 Issue 10 Pages 2912-2917
The catalytic activities of various acids, bases, and salts in formaldehyde polymerization in a liquid carbon dioxide solution were studied in connection with the structures of the catalysts. The activity of the catalysts increased with decreases in the pKa of Brönsted acids and in the ion-dissociation energy of alkyl acetates, and with increases in the pKa′ of organic compounds containing a nitrogen or oxygen atom, such as triethylamine or diethyl ether, and in the pKa of the conjugated acids of sodium salts. The activity of the salts obtained from a strong acid with various bases increased with a decrease in the pKa′ of the bases, while that of the salts from weak acids with weak bases decreased with an increase in the summation of the pKa values of acids and the pKa′ values of bases, reaching a minimum point and then increasing. The activity of various salts decreased with an increase in the pH in an aqueous solution, reached a minimum point at pH 6, then increased.
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